I tried the Mono SL (white bristles) after :-Xusing the black bristled dual trim SL on newly cleaned windows (4-5 cleans) and found the Mono didn't do as good a job as the D T flocked S L. I personally think the Monos are better after youve been cleaning the glass for about a year or so

, then its just a case of maintenance cleans and then Mono one would be sound

. I definitely found it easier to get crap of the frames with the dual trim flocked.
But in the end I suppose much of it comes down to your personal preference which you find by trying out different things, so good luck with that.